OF FISHES FEOM LAKE TANGANYIKA. 553 



21. Auchexoglaxis occidextalis, var. taxgaxicanus. (Plate XXXIII.) 



Depth of body 4 to 4| times in total length, length of head 3 times. Head once 

 and ^ as long as broad, coarsely granulate above ; snout pointed, about f length of 

 head ; diameter of eye 7 to 9 times in length of head, 2 to 2f times in interorbital 

 width, which equals i to f length of snout ; width of mouth about half that of head ; 

 lips thick, papillose ; maxillary barbel about f length of head, extending to posterior 

 border of eye ; outer mandibular barbel as long as or but slightly longer than maxillary, 

 inner mandibular ^ to ^ length of head ; prsemaxillary teeth forming two small groups, 

 which are longer than broad ; mandibular teeth forming a band interrupted in the 

 middle ; occipital process broader than long, in contact with the large intemeural 

 shield. Humeral process small, acutely pointed. Dorsal I 7 ; spine rugose in front, 

 not quite half length of head. Adipose fin 3^ to 5^ times as long as deep, narrowly 

 separated from the rayed dorsal and from the caudal. Anal IV S. Pectoral spine as 

 long as dorsal, feebly serrated in front, strongly behind. Ventral not reaching anal. 

 Caudal rounded or slightly notched. Olive or brownish grey above, with more or 

 less distinct round darker spots, uniform white beneath ; dorsal and caudal fins with 

 numerous round dark spots. 



Total length 350 millim. 



I have previously recorded this species under the name of Auclienoglanis biscutatus. 

 But the Tanganyika!! specimens differ in the longer snout and the narrower interorbital 

 space. They are hardly distinguishable from A. occidentalis C. & V., which inhabits 

 the Nile, the rivers of West Africa, and the Congo, and has also been confounded with 

 A. biscutatus. The above-given description is taken from two specimens from Kalambo 

 and one from the middle of the lake (Moore Collection) and from one from Mtondwe 

 Bay (Cunnington Coll.). Native name : Poloko or Kavungwe. 



22. Syxodoxtis multipuxctatus Blgr. 

 Niamkolo. Native name : Kamwengive. 



23. Syxodoxtis melaxostictus, sp. n. (Plate XXXIV.) 



Body feebly compressed, its depth nearly equal to length of head and 4 times in 

 total length. Head as long as broad, strongly granulate above, the rugosities extending 

 on the snout ; frontal fontanelle narrow ; snout rounded, slightly longer than post- 

 ocular part of head ; eye supero-lateral, nearly 6 times in length of head, twice and 

 \ interorbital width ; occipito-nuchal shield obtusely tectiform ; mouth with moderately 

 developed lips ; maxillary barbel once and \ as long as head, without fringe or 

 border ; mandibular barbels with long simple barbs, the outer nearly as long as the 

 maxillary ; prsemaxillary teeth forming a broad baud, about 15 irregular transverse 

 series ; movable mandibular teeth about 30, the longest \ diameter of eye. Gill-opening 

 not extending below base of pectoral. Humeral process acutely pointed, without 



vol. xvn. — part vi. No. 3. — October, 1906. 4 i: 



